//
//  Copyright (c) 2017 Touch Instinct
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

import Foundation

public extension Double {
    /**
     Type of rounding double value
     - Normal: From 167.567 you will get 167.6
     - Down:   From 167.567 you will get 167.5
     */
    enum RoundingType {
        case normal
        case down
    }

    /**
     Rounding of double value
     - parameter precision: significant digits after decimal point
     - parameter roundType: rounding type
     - returns: rounded value
     */
    func roundValue(withPrecision precision: UInt,
                    roundType: RoundingType = .normal) -> Double {
        let divider = pow(10.0, Double(precision))

        switch roundType {
        case .normal:
            return (self * divider).rounded(.toNearestOrEven) / divider

        case .down:
            return (self * divider).rounded(.down) / divider
        }
    }
}